Boom



FIG. 1 is a perspective view of the boom showing my new design;

FIG. 2 is a bottom plan view of the boom of FIG. 1;

FIG. 3 is a right side elevational view of the boom of FIG. 1;

FIG. 4 is a front elevational view of the boom of FIG. 1;

FIG. 5 is a left side elevational view of the boom of FIG. 1;

FIG. 6 is a top plan view of the boom of FIG. 1; and,

FIG. 7 is a bottom perspective view of the boom of FIG. 1.

The portions of the boom shown in broken lines form no part of the claimed design. 

The ornamental design for a boom, as shown and described. 